mysql storage

Transferred from: http://www.jb51.net/article/62457.htmMyISAM is the default database engine for MySQL (prior to version 5.5), which was improved by the early ISAM (Indexed sequential access method: Indexed sequential access methods). Although

MySQL various storage engines (i) MySQL various storage engine one MyISAM MyISAM file format MyISAM File Repair Storage format for MyISAM tables

#1存储过程Create Procedure greeting ()BEGIN# username = + for + +-hostname + 1 for ' @ 'DECLARE user CHAR (CHARACTER) SET UTF8;SET user = (SELECT current_user ());IF inster (user, ' @ ') > 0 ThenSET user = Substring_index (user, ' @ ', 1);END IF;IF user

Change the sales status of April 20 to the current time period to unsold (1), the sales time to null (0) UPDATE hy_car_detail hcd SET hcd.sales_date = ", Hcd.sales_status = ' 1 ' where HCD . car_id in (Select hc.car_id from Hy_car HC WHERE

1. Transaction InnoDB supports transactional functions, MyISAM not supported.Myisam executes faster and performs better.2. Select, UPDATE, INSERT, delete operation MyISAM: If performing a large number of select,myisam is a better choiceInnoDB: If

1. Innodb support transactions, Myisam does not support transactions2.MyISAM: If performing a large number of select,myisam is a better choice InnoDB: If your data performs a large number of inserts or update, for performance reasons, you should use

Storage Engine: Also known as the table type, refers to the data table storage mechanism, indexing scheme and other ancillary related functions. Different engines, due to different processing methods, will bring different functions or corresponding

ObjectiveThe database storage engine is the database's underlying software organization, and the Database management system (DBMS) uses the data engine to create, query, update, and delete data. Different storage engines provide different storage

I wrote a simple stored procedure with Notepad as follows:delimiter$$CREATE PROCEDURE Show_users ()Comment ' View all information in the user table in the market database 'Beginselect * from user;end$$DelimiterSave As Show_users.sqlExecute

ObjectiveIn the database is a sheet of inextricably linked tables, so the table design is good or bad, will directly affect the entire database. While designing the table, we will focus on one issue and what storage engine to use. Wait a minute,

Faced with the problem of character encoding load to MySQL: It could be gbk/utf-8/or mixed code.To ensure the atomicity of the data, the Rango solution is to convert from Python to 16, and then parse the 16 binary through MySQL parsing, which is

1, transaction processingInnoDB supports transactional features, MyISAM not supported. Myisam executes faster and performs better.  2,select, UPDATE, INSERT, delete operation MyISAM: If performing a large number of select,myisam is a better choice

MyISAM and InnoDB explanationInnoDB and MyISAM are the two most common table types used by many people when using MySQL, both of which have pros and cons, depending on the application. The basic difference is that the MyISAM type does not support

Php+mysql causes of Chinese garbled:1. mysql database encoding is UTF8, and PHP Web page encoding format inconsistent, will cause MySQL in the Chinese garbled.2. Using MySQL to create a table, or select a field when the type is not utf8, and the

The main difference between the two types is that InnoDB supports transactional and foreign key and row-level locks. MyISAM is not supported. So MyISAM tend to be considered only suitable for use in small projects.I use MySQL as a user point of view,

What is a MySQL databaseTypically, a database is a collection of data, and a database can be a collection of files on a memory or a collection of some memory data.What we usually call MySQL database, SQL Server database and so on is actually a

    Hive uses the Derby database to save metadata by default, and the Derby database is relatively small, and only one session can be opened at a time, generally modified to the MySQL database.1. Modify the Conf/hive-site.xml configuration:

MySQL5.5 later uses the InnoDB storage engine by default, where InnoDB and BDB provide transaction-safe tables, and other storage engines are non-transactional security tables.To modify the default engine, you can modify the Default-storage-engine

1, transaction processingInnoDB supports transactional features, MyISAM not supported. Myisam executes faster and performs better. 2,select, UPDATE, INSERT, delete operationMyISAM:if executing a lot of select,myisam is a better choiceInnoDB:If your

MySQL Storage engineMySQL database has many kinds of storage engine, different engine features different, have their own advantages. I've been looking at the MySQL Technology insider, just taking notes.InnoDB Storage EngineThis is the default